package com.smartcar.gateway.utils;
/**
 * AES 128bit 加密解密工具类
 *
 */

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;


public class AesUtil {

    //使用AES-128-CBC加密模式，key需要为16位,key和iv可以相同！
    public static String AES_KEY = "1234567890123456";

    public static String IV = "1234567890123456";


    /**
     * 加密方法
     * @param data  要加密的数据
     * @param key 加密key
     * @param iv 加密iv
     * @return 加密的结果
     * @throws Exception
     */
    public static String encrypt(String data, String key, String iv) throws Exception {
        try {

            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");//"算法/模式/补码方式"NoPadding PkcsPadding
            int blockSize = cipher.getBlockSize();

            byte[] dataBytes = data.getBytes();
            int plaintextLength = dataBytes.length;
            if (plaintextLength % blockSize != 0) {
                plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
            }

            byte[] plaintext = new byte[plaintextLength];
            System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);

            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
            byte[] encrypted = cipher.doFinal(plaintext);

            return new Base64().encodeToString(encrypted);

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 解密方法
     * @param data 要解密的数据
     * @param key  解密key
     * @param iv 解密iv
     * @return 解密的结果
     * @throws Exception
     */
    public static String desEncrypt(String data, String key, String iv) throws Exception {
        try {
            byte[] encrypted1 = new Base64().decode(data);

            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

            cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);

            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original);
            return originalString;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 使用默认的key和iv加密
     * @param data
     * @return
     * @throws Exception
     */
    public static String encrypt(String data) throws Exception {
        return encrypt(data, AES_KEY, IV);
    }

    /**
     * 使用默认的key和iv解密
     * @param data
     * @return
     * @throws Exception
     */
    public static String desEncrypt(String data) throws Exception {
        return desEncrypt(data, AES_KEY, IV);
    }


    /**
     * 测试
     */
    public static void main(String[] args) throws Exception {
        // 加密
        String encrypt = encrypt("{\"username\":\"q2736321299\",\"password\":\"12345678\",\"roleId\":\"2\"}", AES_KEY, IV);
        System.out.println(encrypt);
        //System.out.println("加密后：" + encrypt("123", AES_KEY, IV));
        // 加密
        //System.out.println("解密后：" + desEncrypt("y3BJ39GFbukJzcjWGQ1EliG2rWNMI0hirV0CAeMmdvlAsrR//Jzg30C9JKsYjuTE7J0HbhRyD6C7/BtJ7yh4kA==", AES_KEY, IV));
        System.out.println("解密后：" + desEncrypt("01Kz1lUOejRDN5r0W6Hq1/SSy+ir+zICMgVuUCD7/b6QVR1qh+6FXX45eWCNtWCOUtNC4a7yGx9+AeRlgvjz/uuoSVXxEVd5hI0zB/nk6+n8qQl1TN3AaduQZaOQ6s6KN0UNHN+b6TviZbPHz9X/Rv6nZ+tRcPEHjqZaYGJDIJsI7DYCSzq35sTPRvIOuiHwttzg9AaPZOCuPAf2vPkniYgybfOhYxIgMfZ7bC53gw+We5dKyvZiucVR6vKjovLk+HvpdMkV+iVKuBgOsgQPk0J/iwTpAU4e2rbj+4Pus712yyaa4bPZMFqVSGdjoZv2I32EVSzFE1U9C5i54I1pF4HVMgiYxZQEmboRVnFP49M=", AES_KEY, IV));
    }

}
